//#include<stdio.h>
//int main()
//{
//	char arr[] = "hello world";
//	char* p = arr;
//	printf("%s\n", p);
//	return 0;
//}
#include<stdio.h>
void my_strlen(char arr[], int count)
{
	 count = 0;
	while (arr != '\0')
	{
		arr++;
		count++;
	}
	printf("%d\n", count);
}
int main()
{
	int count = 0;
	char arr[] = "hello world";
	my_strlen(arr,count);
	return 0;
}